slc-lex.l revision 243034
1%{ 2/* 3 * Copyright (c) 2004 Kungliga Tekniska H��gskolan 4 * (Royal Institute of Technology, Stockholm, Sweden). 5 * All rights reserved. 6 * 7 * Redistribution and use in source and binary forms, with or without 8 * modification, are permitted provided that the following conditions 9 * are met: 10 * 11 * 1. Redistributions of source code must retain the above copyright 12 * notice, this list of conditions and the following disclaimer. 13 * 14 * 2. Redistributions in binary form must reproduce the above copyright 15 * notice, this list of conditions and the following disclaimer in the 16 * documentation and/or other materials provided with the distribution. 17 * 18 * 3. Neither the name of the Institute nor the names of its contributors 19 * may be used to endorse or promote products derived from this software 20 * without specific prior written permission. 21 * 22 * THIS SOFTWARE IS PROVIDED BY THE INSTITUTE AND CONTRIBUTORS ``AS IS'' AND 23 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE 24 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE 25 * ARE DISCLAIMED. IN NO EVENT SHALL THE INSTITUTE OR CONTRIBUTORS BE LIABLE 26 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL 27 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS 28 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) 29 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT 30 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY 31 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF 32 * SUCH DAMAGE. 33 */ 34 35/* $Id$ */ 36 37#undef ECHO 38 39#include <stdio.h> 40#include <string.h> 41#include <stdarg.h> 42#include <stdlib.h> 43#include "slc.h" 44#include "slc-gram.h" 45unsigned lineno = 1; 46 47static void handle_comment(void); 48static char * handle_string(void); 49 50#undef ECHO 51 52%} 53 54%option nounput 55 56%% 57[A-Za-z][-A-Za-z0-9_]* { 58 yylval.string = strdup ((const char *)yytext); 59 return LITERAL; 60 } 61"\"" { yylval.string = handle_string(); return STRING; } 62\n { ++lineno; } 63\/\* { handle_comment(); } 64[={}] { return *yytext; } 65[ \t] ; 66%% 67 68void 69error_message (const char *format, ...) 70{ 71 va_list args; 72 73 va_start (args, format); 74 fprintf (stderr, "%s:%d: ", filename, lineno); 75 vfprintf (stderr, format, args); 76 va_end (args); 77 error_flag++; 78} 79 80void 81yyerror (char *s) 82{ 83 error_message("%s\n", s); 84} 85 86static void 87handle_comment(void) 88{ 89 int c; 90 int start_lineno = lineno; 91 int level = 1; 92 int seen_star = 0; 93 int seen_slash = 0; 94 while((c = input()) != EOF) { 95 if(c == '/') { 96 if(seen_star) { 97 if(--level == 0) 98 return; 99 seen_star = 0; 100 continue; 101 } 102 seen_slash = 1; 103 continue; 104 } else if(c == '*') { 105 if(seen_slash) { 106 level++; 107 seen_star = seen_slash = 0; 108 continue; 109 } 110 seen_star = 1; 111 continue; 112 } 113 seen_star = seen_slash = 0; 114 if(c == '\n') { 115 lineno++; 116 continue; 117 } 118 } 119 if(c == EOF) 120 error_message("unterminated comment, possibly started on line %d\n", start_lineno); 121} 122 123static char * 124handle_string(void) 125{ 126 char x[1024]; 127 int i = 0; 128 int c; 129 int quote = 0; 130 while((c = input()) != EOF){ 131 if(quote) { 132 x[i++] = '\\'; 133 x[i++] = c; 134 quote = 0; 135 continue; 136 } 137 if(c == '\n'){ 138 error_message("unterminated string"); 139 lineno++; 140 break; 141 } 142 if(c == '\\'){ 143 quote++; 144 continue; 145 } 146 if(c == '\"') 147 break; 148 x[i++] = c; 149 } 150 x[i] = '\0'; 151 return strdup(x); 152} 153 154int 155yywrap () 156{ 157 return 1; 158} 159